During a cell-mediated immune response, which of the following describes how infected cells are detected by the immune system? a
The infected cell's membrane shows some of the antigens of the invading pathogen.

b
The pathogen engulfs and destroys healthy cells, leaving antigens behind.

c
Antibodies bind with the pathogen's antigens, causing inflammation and swelling.

d
Memory B cells recognize the cell shape that results from infection by specific pathogens.

Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.